Absolutely the easiest way to store green beans for winter use..... String them up to dry.
Not sure why these are called leather breeches, maybe from using the needle and thread to string them up, or maybe the way they look after a week or two of air drying.
When needed, I slide a few off of the string and into a pot of hot water, add a smoked ham hock or hunk of bacon and let them simmer til tender. They will be tasty on a cold winter day. :)